GDM always on internal display

[Robert M. Albrecht]

Hi,

my laptops docking station is connected (dvi) to an external display.In 
gnome system settings, the external monitor is definied as primary display.

When the laptops boots while docked, the GDM shows up on the internal 
displays. The desktops after logging in is on the external display.

The GDM even shows up on the laptops display, when the laptop is closed.

This did not happen on Fedora 16.

Is this a bug, a feature, a configuration problem or a graphics driver 
problem ?

cu romal